An experimental investigation of damage evolution in a ceramic matrix composite

Article Abstract:

Analysis of damage development in a glass-ceramic matrix composite through uniaxial tension experiments and scanning electron microscopy technique reveals the presence of 'zones of deformation' that play a role in the initiation of damage processes. Properties of the fiber and matrix, the zones of deformation and the material processing help account for the stress-strain behavior in the materials. A high resolution data acquisition system helps perform the ultrasonic wave speed and acoustic emission measurements for monitoring the damage development.

Research, Analysis, Deformations (Mechanics), Deformation, Strains and stresses, Stresses (Materials)

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Ultrasonic assessment of interfacial oxidation damage in ceramic matrix composites

Article Abstract:

Ultrasonic techniques are used in the characterization of oxidation damage in ceramic matrix composites. The angular dependence of longitudinal and transverse velocities is measured to nondestructively determine the elastic constants. The anisotropic properties of an effective fiber are determined by a micromechanical model for composites with anisotropic constituents. The experimental data also enable the determination of the effective elastic moduli of the interfacial carbon coating.

Usage, Influence, Observations, Oxidation-reduction reaction, Oxidation-reduction reactions, Ultrasonic waves, Ultrasound

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Matrix cracking with irregular fracture fronts as observed in fiber reinforced ceramic composites

Article Abstract:

Matrix cracking is a major failure mode in fiber reinforced ceramic composites. A theoretical treatment of mechanical responses of fiber reinforced ceramic composites undergoing matrix cracking, is presented. Detailed investigations of differences between small crack-size matrix cracking and large crack size were undertaken. The Mori-Tanaka method was used to treat cracks and reinforcing fibers, with effective properties obtained by a modification of the method.

Fatigue (Materials), Fibrous composites, Fiber reinforced composites

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